Firstly ,you should observe its serial number , Second , watch the tag of bracelet . If your omega watch is metal watchband , there will be some tag in the band and must have a number of bracelet .Third note the needle , most replica watches will leakage in its needle . don't look upon this small thing ,but it is not easy to make the same just like the real one . The needle of original omega is very shine and smooth . Fourth , the character and paint lock in the dial also should keep the appearance brightness and holotactic . Fifth , the guarantee card is also an important evidence that can proof it is a genuine watch . Omega watch has more than two warranty card ,their size is the same as credit card . There will have watch model ,product series number and retailer's kohlrabiblue .